大约有 42,000 项符合查询结果(耗时:0.0477秒) [XML]

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'this' vs $scope in AngularJS controllers

... "How does this and $scope work in AngularJS controllers?" Short answer: this When the controller constructor function is called, this is the controller. When a function defined on a $scope object is called, this is the "scope in effec...
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Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?

...nce is that two classes may define different ways of doing the same thing, and the subclass can't choose which one to pick. share | improve this answer | follow ...
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Java generics - why is “extends T” allowed but not “implements T”?

...lass 'implements' or 'extends'. The constraint possibilities are 'extends' and 'super' - that is, is this class to operate with assignable to that other one (extends), or is this class assignable from that one (super). share...
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Generate random numbers following a normal distribution in C/C++

How can I easily generate random numbers following a normal distribution in C or C++? 18 Answers ...
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What's wrong with nullable columns in composite primary keys?

...keys is not clean relational database design. If there are two entities A and B where A can optionally be related to B, the clean solution is to create a resolution table (let's say AB). That table would link A with B: If there is a relationship then it would contain a record, if there isn't then i...
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How does facebook, gmail send the real time notification?

I have read some posts about this topic and the answers are comet, reverse ajax, http streaming, server push, etc. 5 Answer...
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What exactly do “u” and “r” string flags do, and what are raw string literals?

...no "escape sequences" to represent newlines, tabs, backspaces, form-feeds, and so on. In normal string literals, each backslash must be doubled up to avoid being taken as the start of an escape sequence. This syntax variant exists mostly because the syntax of regular expression patterns is heavy w...
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Why we should not use protected static in java

...able exists at class level, it does not exist separately for each instance and it does not have an independent existence in classes which extend me. Think about what protected means: This variable can be seen by this class, classes in the same package and classes which extend me. The two mea...
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Passing data between a fragment and its container activity

How can I pass data between a fragment and its container activity? Is there something similar to passing data between activities through intents? ...
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When to use thread pool in C#? [closed]

I have been trying to learn multi-threaded programming in C# and I am confused about when it is best to use a thread pool vs. create my own threads. One book recommends using a thread pool for small tasks only (whatever that means), but I can't seem to find any real guidelines. What are some consid...